Permissive Licenced Firmware???

Hi!!
Do anyone knows a Permissive Licenced Firmware for 3d printers?

Hey,
My APrinter firmware is licenced under the BSD 2-clause licence, except some 3rd party libraries (e.g. the used libraries from chip manufacturers like ASF and STM32F4Cube, and lwIP (3-clause) if you use networking).

Edited 1 time(s). Last edit at 03/04/2016 12:21PM by ambrop7.

Thanks! I found GRBL but it needed many modifications to work on a 3d printer. I'm going to use a STM32(more Pins) or ATmega328P(Cheaper) in a low cost (less than 500$/€) fully assembled 3d printer. This printer will be very similar in specs with prusa i3, about the same printing volume, a little bit faster (I hope), one extruder(E3d or custom made), way smaller, heated bed with acrylic panel(glass sucks), et cetera.